Add Support for OperaGX Browser

[Yukigamine]

Is your feature request related to a problem? Please describe.
At this time, ua-parser-js does not identify the OperaGX Browser.

• On iOS it shows up as Safari / Mobile Safari.
• On Android it shows up as Chrome / Mobile Chrome
• I have not yet checked desktop, but I suspect it would appear as Chrome/Chromium.

Describe the solution you'd like
I would like to see OperaGX added to list of supported browsers.

Describe alternatives you've considered
I manually check the UA string for OperaGX's unique key, OPX.